/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.tsfile.encoding.encoder;

import org.apache.iotdb.tsfile.common.conf.TSFileConfig;
import org.apache.iotdb.tsfile.exception.encoding.TsFileEncodingException;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.utils.Binary;
import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigDecimal;

public class PlainEncoder extends Encoder {

    private static final Logger logger = LoggerFactory.getLogger(PlainEncoder.class);
    private TSDataType dataType;
    private int maxStringLength;

    public PlainEncoder(TSDataType dataType, int maxStringLength) {
        super(TSEncoding.PLAIN);
        this.dataType = dataType;
        this.maxStringLength = maxStringLength;
    }

    @Override
    public void encode(boolean value, ByteArrayOutputStream out) {
        if (value) {
            out.write(1);
        } else {
            out.write(0);
        }
    }

    @Override
    public void encode(short value, ByteArrayOutputStream out) {
        out.write((value >> 8) & 0xFF);
        out.write(value & 0xFF);
    }

    @Override
    public void encode(int value, ByteArrayOutputStream out) {
        ReadWriteForEncodingUtils.writeVarInt(value, out);
    }

    @Override
    public void encode(long value, ByteArrayOutputStream out) {
        for (int i = 7; i >= 0; i--) {
            out.write((byte) (((value) >> (i * 8)) & 0xFF));
        }
    }

    @Override
    public void encode(float value, ByteArrayOutputStream out) {
        int floatInt = Float.floatToIntBits(value);
        out.write((floatInt >> 24) & 0xFF);
        out.write((floatInt >> 16) & 0xFF);
        out.write((floatInt >> 8) & 0xFF);
        out.write(floatInt & 0xFF);
    }

    @Override
    public void encode(double value, ByteArrayOutputStream out) {
        encode(Double.doubleToLongBits(value), out);
    }

    @Override
    public void encode(Binary value, ByteArrayOutputStream out) {
        try {
            // write the length of the bytes
            encode(value.getLength(), out);
            // write value
            out.write(value.getValues());
        } catch (IOException e) {
            logger.error(
                    "tsfile-encoding PlainEncoder: error occurs when encode Binary value {}", value, e);
        }
    }

    @Override
    public void flush(ByteArrayOutputStream out) {
        // This is an empty function.
    }

    @Override
    public int getOneItemMaxSize() {
        switch (dataType) {
            case BOOLEAN:
                return 1;
            case INT32:
                return 4;
            case INT64:
                return 8;
            case FLOAT:
                return 4;
            case DOUBLE:
                return 8;
            case TEXT:
                // refer to encode(Binary,ByteArrayOutputStream)
                return 4 + TSFileConfig.BYTE_SIZE_PER_CHAR * maxStringLength;
            default:
                throw new UnsupportedOperationException(dataType.toString());
        }
    }

    @Override
    public long getMaxByteSize() {
        return 0;
    }

    @Override
    public void encode(BigDecimal value, ByteArrayOutputStream out) {
        throw new TsFileEncodingException(
                "tsfile-encoding PlainEncoder: current version does not support BigDecimal value encoding");
    }
}
